Tsai Chia-Hsin (Chinese: 蔡佳欣; traditional Chinese: 蔡佳欣; pinyin: Cài Jiāxīn; Wade–Giles: Ts'ai Chia-hsin; born 25 July 1982) is a male badminton player from Taiwan.
Tsai competed for the Republic of China (as Chinese Taipei) in badminton at the 2004 Summer Olympics in mixed doubles with partner Cheng Wen-Hsing. They defeated Chris Dednam and Antoinette Uys of South Africa in the first round but lost to Zhang Jun and Gao Ling of China in the round of 16.
http://www.sports-reference.com/olympics/athletes/ts/tsai-chia-hsin-1.html